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ASSE 1001

2017 Edition, November 1, 2016

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Performance Requirements for Atmospheric Type Vacuum Breakers

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Description / Abstract:


Vacuum breakers shall be classified in two general types:

  • Atmospheric type, as described herein

  • Pressure type (See ASSE Standard 1020, Performance Requirements for Pressure Vacuum Breaker Assembly, and ASSE Standard 1056, Spill Resistant Vacuum Breakers)

The atmospheric type design shall consist of:

a) A check valve member

b) An air inlet valve that is closed when the check valve member is open, and normally open when the check valve member is normally closed.

The atmospheric type design can be further classified into three categories, depending on use:

1) Pipe-applied

2) Flushometer-applied

3) Integrally-applied

Devices shall include an air inlet shield.


Pipe-applied vacuum breaker assembly inlet and outlet pipe sizes shall range from ⅛ NPT to 4 NPT (3 mm to 100 mm). Flushometer-applied and integrally-applied vacuum breaker assemblies’ inlet and outlet sizes are determined based on the smallest fitting they are designed to be installed to. 

Working Pressure

Devices shall be designed to operate within a working pressure of 8.0 psi (55 kPa) to a minimum of 125.0 psi (861.9 kPa).

Temperature Range

a) Devices limited to cold water service shall operate within a range from 33 °F +2.0 °F, –0 °F to 110 °F +0 °F, –2.0 °F (0.56 °C +1.1 °C, –0 °C to 43.3 °C +0 °C, –1.1 °C)

b) Devices intended for hot or cold water service shall operate within a range from 33 °F +2.0 °F, –0 °F to 180.0 °F +0 °F, –2.0 °F (0.56 °C +1.1 °C, –0 °C to 82.2 °C +0 °C, –1.1 °C) or to the manufacturer’s specifications, whichever is greater.